BOULEVARD (CNS) - A search was underway today for a man suspected of  kidnapping at least one of two missing children, killing their mother and  setting fire to a home in Boulevard, where the woman's body was found, along  with that of an unidentified child.

Hannah Anderson, 16, and Ethan Anderson, 8, may have been taken by James  Lee DiMaggio, 40, who is believed to have been in a ``close platonic  relationship'' with their mother, 44-year-old Christina Anderson of 
Lakeside,  according to the San Diego County Sheriff's Department.

Anderson's body and a dead dog were found as fire crews were  extinguishing the blaze at DiMaggio's home and detached garage at 2071 Ross  Ave. shortly after  Sunday, sheriff's Lt. Glenn Giannantonio said. The  body of a child was also found as crews searched through the rubble of one of  the burned buildings, he said.

Investigators determined that Anderson was the victim of homicide,  Giannantonio said without elaboration. How the child died was not immediately  determined, he said.

``We believe he murdered Anderson, and we believe that he set the  structure on fire,'' Giannantonio told reporters Monday night.

A statewide amber alert was issued after the disappearance of Hannah and  Ethan Anderson. Investigators believe one or both of them were abducted by  DiMaggio, who may be driving a 2013 blue Nissan VersaCalifornia license plate  6WCU986. The suspect is believed to be travelling to either Texas or Canada,  according to the alert.

DiMaggio is 5 feet 9, 150 pounds, with brown hair and brown eyes. Hannah  is 5 feet 7, 115 pounds, with blond hair, blue eyes, a belly button ring,  nose stud and pierced ears. Ethan is 4 feet 11, 64 pounds, with sandy blond  hair. All three are white.

Anyone with information on the whereabouts of the children or suspect  should call the San Diego Sheriff's Department at (858) 565-5200, or Crime  Stoppers at (888) 580-8477.